// Copyright 2019 Extreme Networks, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

export default function(container, element) {
  if (!container || !element) {
    return;
  }

  const containerOffset = container.getBoundingClientRect();
  const elementOffset = element.getBoundingClientRect();
  const topDiff = elementOffset.top - containerOffset.top;
  const bottomDiff = topDiff + elementOffset.height - containerOffset.height;

  if (topDiff < 0) {
    container.scrollTop += topDiff;
  }
  else if (bottomDiff > 0) {
    container.scrollTop += bottomDiff;
  }
}
